The objections boil down to: XP for interaction will lead to bad interaction. I hope you can see the problem. If the point is valid, we should consider removing XP++ for all actions unless they are reviewed by a committee of sufficiently enlightened monks to ensure the votes are not hasty, punitive, wrong-headed, blah, blah, blah, bonk, bonk on the head.

XP is mostly a measure of participation. There's no exceptional reason to bar this form of participation from the tally; Gods willing.